Recently, someone I’ve never met introduced me in an email as “my good friend Adam.” A few days later, a virtual stranger who has emailed me a few times posted an article by “my friend Adam.” Then a student listed me as a job reference, and when asked to describe our relationship, wrote “professor and friend.” After I endorsed a book, a reporter referred to the author as “a friend of Adam’s,” when our interactions have consisted of a series of work emails and one phone call.

I like all of these people, but I wouldn’t describe any of them as my friends—I think that misrepresents how well we know each other and the kind of the bond between us. In the Facebook era, the boundaries on friendship have expanded dramatically. Someone recently called my brother-in-law a “dear friend” but didn’t bother to attend his wedding. Judging from recent friend requests, my friends apparently include a person who ignored me in grad school, a second cousin’s high school classmate, a colleague’s mentee, a peewee soccer teammate I vaguely remember, and some guy who sat at a table near me at a restaurant once.

If you want to avoid committing the faux pas of describing a colleague or an acquaintance as a friend, here are some rules for when it’s fair game to use the term:

1. You’ve actually met in person

From the caption of a famous New Yorker cartoon: “On the Internet, nobody knows you’re a dog.” If you’ve only connected by email or phone, even if they are a real person, there’s no substitute for the trust that can be developed from meeting face-to-face.

2. You know embarrassing things about each other that don’t show up in a Google search

Studies consistently show that self-disclosure—opening up and making yourself vulnerable—is one of the strongest drivers of close relationships. My friends know that I have questionable taste in music, and refrain from dissing Bryan Adams. They accept the fact that I read the first Twilight book, cover to cover (my wife made me do it) and the rest of them (that was my doing).

3. You call each other without scheduling a conversation

Unless the person in question is a head of state, if you have to get an appointment on someone’s calendar to talk, you haven’t cleared the friendship bar.

4. You never discuss the weather

When you ask a friend “How are you doing?” you don’t have to follow up with “No, really, how are you doing?” Friends don’t bother with small talk. They can go months without talking, and pick up as if they’ve never skipped a beat. They dive right into deep conversations about love, life, and that exasperating conclusion of Lost where nothing was resolved.

5. You help each other without keeping score

In professional relationships, I find that most people follow the norm of reciprocity: When we do someone a favor, we expect an equal one back. In friendships, the norm shifts from reciprocity to generosity. We focus on what our friends need, not what we can get back from them. Instead of keeping tallies of credits and debts, friends give whenever they can. As Jack Handey says, “If you wear a toupee, why not let your friends try it on for a while? Come on, we’re not going to hurt it.”

6. You’ve had meaningful experiences together

Men and women alike expect friendships to involve mutual activities and shared memories. If you’ve never gone to a movie or shopping together, played a sport or game together, attended a party together, or decorated someone’s car with shaving cream together, you’re probably not friends.

7. You give the critical feedback that we don’t want to hear, but need to hear

Friendships have what the organizational scholars Jane Dutton and Emily Heaphy call “tensility”—the carrying capacity to withstand criticism and bounce back from strain. “We wouldn’t want to assume that compassion is always gentle,” George Saunders observes. “A harsh truth can be compassionate . . . if a friend is wearing something ridiculous, you can say, ‘You look like an idiot,’ and maybe that will save him.”

If you’re reading this post on LinkedIn, you’re probably not my friend. Because if you were my friend, you would know better than to read my content.

Adam Grant is the youngest tenured professor at Wharton. He has been recognized as Wharton’s single-highest-rated teacher, one of BusinessWeek’s favorite professors, and one of the world’s 40 best business professors under 40. Previously, he was a record-setting advertising director at Let’s Go Publications, an All-American springboard diver, and a professional magician. Adam is the author of the New York Times and Wall Street Journal bestseller Give and Take: A Revolutionary Approach to Success. He earned his Ph.D. in organizational psychology from the University of Michigan, completing it in less than three years, and his B.A. from Harvard University, magna cum laude with highest honors and Phi Beta Kappa honors. He has been honored with the Excellence in Teaching Award for every class that he has taught and has presented for leaders at organizations such as Google, the NFL, Merck, Pixar, Goldman Sachs, Facebook, Microsoft, Apple, the United Nations, the World Economic Forum, and the U.S. Army, Navy, and Air Force.

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